public static class Program
{
    public interface IConvertible<T>
    {
        T Convert();
        T Convert<T>();
    }
    public class ConvertMe : IConvertible<int>, IConvertible<float>
    {
        public double Value;
        int IConvertible<int>.Convert() { return (int)Value; }
        float IConvertible<float>.Convert() { return (float)Value; }
        public T Convert<T>() { return ((IConvertible<T>)this).Convert(); }
    }
    public static void Main()
    {
        ConvertMe c = new ConvertMe();
        c.Value = 12.3456789;
        Console.WriteLine(c.Convert<int>());
        Console.WriteLine(c.Convert<float>());
        Console.ReadKey();
    }
}

public interface IConvertible<T>
{
    T Convert();
}

public sealed class ConvertMe : IConvertible<int>, IConvertible<float>
{
    public double Value;
    int IConvertible<int>.Convert() { return (int)Value; }
    float IConvertible<float>.Convert() { return (float)Value; }
}

public static class Program
{
    public static void Main()
    {
       ConvertMe c = new ConvertMe();
       c.Value = 12.3456789;
       Console.WriteLine(((IConvertible<int>)c).Convert());
       Console.WriteLine(((IConvertible<float>)c).Convert());
    }
}

public static class Specialisation
{
    public static Specialisation<T> For<T>()
    {
        return Specialisation<T>.Instance;
    }
}

Specialised s = new Specialised();
s.Value = 12.3456789;
Console.WriteLine(s.SpecialisedMethod(Specialisation.For<int>()));
Console.WriteLine(s.SpecialisedMethod(Specialisation.For<float>()));
Console.ReadKey();